No the name was derived by Chaudhry Rahmat Ali in 1934, even before partition. This is his defination, you can search for him on the internet to find out more.
Karachi is a city in the Sindh province of Pakistan.
P = Punjab (West)
A = Afghan province (NWFP)
K = Kashmir
I = Indus
S = Sindh
-TAN = BalochisTAN
Where are Bengalis in this definition by Chaudhry Rahmat Ali in 1934? Don't tell me you had decided even before partition to not treat muslim bengal as part of pakistan.
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